We should add tests for the stuff we touched in bug 912717 to ensure that we properly restore session cookies with a full session restore, and also handle deferred session restores correctly.
Here are the tests I started. They don't really work yet but are probably a good starting point. I'll definitely not get to this in the next two weeks (PTO), but I might not actually get to it at all. So, anyone, please feel free to pick this up :)
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